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# FileMaker Pro Custom Functions

ValStdDevS( ValueList ; ArithMeanValue )

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Average rating: 4.1  (20 votes)
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Bill Thurmes, Miyota Development Center of America

Gives the standard deviation of a sample, where the set of numbers are in a value list

Sample Input:
 ValStdDevS ( "5¶8¶24¶3¶6" ; ValueMean ( "5¶8¶24¶3¶6" ) ) ValStdDevS ( "5" ; ValueMean ( "5¶8¶24¶3¶6" ) ) ValStdDevS ( "5¶a¶24¶3¶6" ; ValueMean ( "5¶a¶24¶3¶6" ) )
Sample Output:
 8.467585... ? --> divides by N-1; N=1; so, divide by 0 9.44986... ['a' resolves as 0]

Then copy & paste into FileMaker Advanced's Edit Custom Function window.

## Description:

The native StDev function in FileMaker only works on fields, but it is often more efficient to work with value lists and do all calculations in memory. This is particularly true when you use ESQL, where the answer is returned as a value list. The ValStdDevS function gives the standard deviation of a set of numerical values in a ¶-delimited value list. This uses the square root of (the sum of squares divided by N-1); for some uses, ValStdDev (which uses N) is more appropriate. One caveat: if a non-numerical value is used, it is evaluated as 0.

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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